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Kalra A, Bagchi V, Paraskevopoulou P, Das P, Ai L, Sanakis Y, Raptopoulos G, Mohapatra S, Choudhury A, Sun Z, Cundari TR, Stavropoulos P. Is the Electrophilicity of the Metal Nitrene the Sole Predictor of Metal-Mediated Nitrene Transfer to Olefins? Secondary Contributing Factors as Revealed by a Library of High-Spin Co(II) Reagents. Organometallics 2021; 40:1974-1996. [PMID: 35095166 PMCID: PMC8797515 DOI: 10.1021/acs.organomet.1c00267] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Recent research has highlighted the key role played by the electron affinity of the active metal-nitrene/imido oxidant as the driving force in nitrene additions to olefins to afford valuable aziridines. The present work showcases a library of Co(II) reagents that, unlike the previously examined Mn(II) and Fe(II) analogues, demonstrate reactivity trends in olefin aziridinations that cannot be solely explained by the electron affinity criterion. A family of Co(II) catalysts (17 members) has been synthesized with the assistance of a trisphenylamido-amine scaffold decorated by various alkyl, aryl, and acyl groups attached to the equatorial amidos. Single-crystal X-ray diffraction analysis, cyclic voltammetry and EPR data reveal that the high-spin Co(II) sites (S = 3/2) feature a minimal [N3N] coordination and span a range of 1.4 V in redox potentials. Surprisingly, the Co(II)-mediated aziridination of styrene demonstrates reactivity patterns that deviate from those anticipated by the relevant electrophilicities of the putative metal nitrenes. The representative L4Co catalyst (-COCMe3 arm) is operating faster than the L8Co analogue (-COCF3 arm), in spite of diminished metal-nitrene electrophilicity. Mechanistic data (Hammett plots, KIE, stereocontrol studies) reveal that although both reagents follow a two-step reactivity path (turnover-limiting metal-nitrene addition to the C b atom of styrene, followed by product-determining ring-closure), the L4Co catalyst is associated with lower energy barriers in both steps. DFT calculations indicate that the putative [L4Co]NTs and [L8Co]NTs species are electronically distinct, inasmuch as the former exhibits a single-electron oxidized ligand arm. In addition, DFT calculations suggest that including London dispersion corrections for L4Co (due to the polarizability of the tert-Bu substituent) can provide significant stabilization of the turnover-limiting transition state. This study highlights how small ligand modifications can generate stereoelectronic variants that in certain cases are even capable of overriding the preponderance of the metal-nitrene electrophilicity as a driving force.
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Affiliation(s)
- Anshika Kalra
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, United States
| | - Vivek Bagchi
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, United States; Institute of Nano Science and Technology, Mohali, Punjab 160062, India
| | - Patrina Paraskevopoulou
- Inorganic Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, Athens 15771, Greece
| | - Purak Das
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, United States
| | - Lin Ai
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, United States; College of Chemistry, Beijing Normal University, Beijing 100875, People's Republic of China
| | - Yiannis Sanakis
- Institute of Advanced Materials, Physicochemical Processes, Nanotechnology and Microsystems, NCSR "Demokritos", Athens 15310, Greece
| | - Grigorios Raptopoulos
- Inorganic Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, Athens 15771, Greece
| | - Sudip Mohapatra
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, United States
| | - Amitava Choudhury
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, United States
| | - Zhicheng Sun
- Department of Chemistry, Center for Advanced Scientific Computing and Modeling (CASCaM), University of North Texas, Denton, Texas 76203, United States
| | - Thomas R Cundari
- Department of Chemistry, Center for Advanced Scientific Computing and Modeling (CASCaM), University of North Texas, Denton, Texas 76203, United States
| | - Pericles Stavropoulos
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, United States
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Esarte Palomero O, Jones RA. Accessing Pentagonal Bipyramidal Geometry with Pentadentate Pincer Amido-bis(amidate) Ligands in Group IV and V Early Transition Metal Complexes. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Orhi Esarte Palomero
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Richard A. Jones
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States
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Baulina ТV, Kudryavtsev IY, Sykat GY, Brel’ VK. Synthesis of Functionalized Tris(2-propoxyphenyl)phosphine Oxides as Precursors of Tripodal Propeller-Shaped Ligands. RUSS J GEN CHEM+ 2018. [DOI: 10.1134/s1070363218090281] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Bagchi V, Kalra A, Das P, Paraskevopoulou P, Gorla S, Ai L, Wang Q, Mohapatra S, Choudhury A, Sun Z, Cundari TR, Stavropoulos P. Comparative Nitrene-Transfer Chemistry to Olefinic Substrates Mediated by a Library of Anionic Mn(II) Triphenylamido-Amine Reagents and M(II) Congeners (M = Fe, Co, Ni) Favoring Aromatic over Aliphatic Alkenes. ACS Catal 2018. [DOI: 10.1021/acscatal.8b01941] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Vivek Bagchi
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, United States
| | - Anshika Kalra
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, United States
| | - Purak Das
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, United States
| | - Patrina Paraskevopoulou
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, United States
- Laboratory of Inorganic Chemistry, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis Zografou 15771, Athens, Greece
| | - Saidulu Gorla
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, United States
| | - Lin Ai
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, United States
- College of Chemistry, Beijing Normal University, Beijing 100875, People’s Republic of China
| | - Qiuwen Wang
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, United States
| | - Sudip Mohapatra
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, United States
| | - Amitava Choudhury
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, United States
| | - Zhicheng Sun
- Department of Chemistry, Center for Advanced Scientific Computing and Modeling (CASCaM), University of North Texas, Denton, Texas 76203, United States
| | - Thomas R. Cundari
- Department of Chemistry, Center for Advanced Scientific Computing and Modeling (CASCaM), University of North Texas, Denton, Texas 76203, United States
| | - Pericles Stavropoulos
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, United States
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Abstract
Two new Eu(II)-containing cryptates were prepared with a new nitrogenous cryptand functionalized with three benzo groups. The introduction of three aromatic rings into the ligand backbone imparts lopsided geometrical features on the resulting Eu(II) coordination environments. In both complexes, the interactions between Eu and the amines on the aromatic side of the molecule are weaker than those on the nonaromatic side, resulting in one discrete unit with two distinct faces. One of the new complexes is, to the best of our knowledge, the first direct observation of a bis-aquo Eu(II)-containing cryptate with two nonadjacent inner-sphere water molecules. In addition to solid-phase structure, the electronic UV-visible and emission spectra of the new complexes were studied in acetonitrile. Experimental results show that the decreased Lewis basicity of the aromatic face hypsochromically shifts absorbances and emissions from a structurally related compound without the benzo groups.
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Affiliation(s)
- Guo-Xia Jin
- College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Shandong Normal University , Jinan 250014, P. R. China.,Department of Chemistry, Wayne State University , Detroit, Michigan 48202, United States
| | - Matthew D Bailey
- Department of Chemistry, Wayne State University , Detroit, Michigan 48202, United States
| | - Matthew J Allen
- Department of Chemistry, Wayne State University , Detroit, Michigan 48202, United States
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Marshall-Roth T, Brown SN. Redox activity and π bonding in a tripodal seven-coordinate molybdenum(vi) tris(amidophenolate). Dalton Trans 2015; 44:677-85. [DOI: 10.1039/c4dt02936d] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A tripodal seven-coordinate tris(amidophenolato)molybdenum(vi) complex shows strong ligand-to-metal π donation (40 kcal mol−1 per π bond) and undergoes facile ligand-centered oxidation.
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Affiliation(s)
| | - Seth N. Brown
- Department of Chemistry and Biochemistry
- University of Notre Dame
- Notre Dame
- USA
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Batke S, Sietzen M, Wadepohl H, Ballmann J. A tripodal benzylene-linked trisamidophosphine ligand scaffold: synthesis and coordination chemistry with group(IV) metals. Inorg Chem 2014; 53:4144-53. [PMID: 24712705 DOI: 10.1021/ic500163c] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
A new tripodal trisamidophosphine ligand (1) based on the trisbenzylphosphine backbone has been synthesized in three steps starting from NaPH2 and phthaloyl-protected 2-aminobenzyl bromide. At elevated temperatures, 1 reacts directly with M(NMe2)4 (M = Zr, Hf) to afford the dimethylamido complexes [PN3]M(NMe2) (M = Zr, Hf) (2), which are easily converted into the corresponding triflates [PN3]MOTf (M = Zr, Hf) (3) via reaction with triethylsilyl trifluoromethanesulfonate. The related titanium chloro complex [PN3]TiCl (4-Ti) is obtained from 1 and Bn3TiCl via protonolysis. Triple deprotonation of 1 with n-butyllithium affords the tris-lithium salt Li3[PN3] (1-Li), which serves as a common starting material for the preparation of all the group(IV) chlorides [PN3]MCl (M = Ti, Zr, Hf) (4). Upon treatment of 4-Ti with Bn2Mg(thf)2, formation of a benzyltitanium species is observed, which is converted cleanly into a ligand-CH-activated species (5-Ti).
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Affiliation(s)
- Sonja Batke
- Anorganisch-Chemisches Institut, Universität Heidelberg , Im Neuenheimer Feld 276, 69120 Heidelberg, Germany
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Bagchi V, Raptopoulos G, Das P, Christodoulou S, Wang Q, Ai L, Choudhury A, Pitsikalis M, Paraskevopoulou P, Stavropoulos P. Synthesis and characterization of a family of Co(II) triphenylamido-amine complexes and catalytic activity in controlled radical polymerization of olefins. Polyhedron 2013. [DOI: 10.1016/j.poly.2012.11.020] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Liu L, Alam MS, Lee DU. Synthesis, Antioxidant Activity and Fluorescence Properties of Novel Europium Complexes with (E)-2- or 4-hydroxy-N'-[(2-hydroxynaphthalen-1-yl)methylene]benzohydrazide Schiff Base. B KOREAN CHEM SOC 2012. [DOI: 10.5012/bkcs.2012.33.10.3361] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Xiao J, Deng L. Synthesis, Structure, and Reactivity Study of Iron(II) Complexes with Bulky Bis(anilido)thioether Ligation. Organometallics 2011. [DOI: 10.1021/om201010a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jie Xiao
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy
of Sciences, 345 Lingling Road, Shanghai, People’s Republic
of China 200032
| | - Liang Deng
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy
of Sciences, 345 Lingling Road, Shanghai, People’s Republic
of China 200032
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12
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Jones MB, Hardcastle KI, Hagen KS, MacBeth CE. Oxygen Activation and Intramolecular C–H Bond Activation by an Amidate-Bridged Diiron(II) Complex. Inorg Chem 2011; 50:6402-4. [DOI: 10.1021/ic2007183] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Matthew B. Jones
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| | | | - Karl S. Hagen
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| | - Cora E. MacBeth
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States
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13
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Alliger GE, Müller P, Do LH, Cummins CC, Nocera DG. Family of Cofacial Bimetallic Complexes of a Hexaanionic Carboxamide Cryptand. Inorg Chem 2011; 50:4107-15. [DOI: 10.1021/ic200143b] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Glen E. Alliger
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139-4307, United States
| | - Peter Müller
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139-4307, United States
| | - Loi H. Do
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139-4307, United States
| | - Christopher C. Cummins
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139-4307, United States
| | - Daniel G. Nocera
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139-4307, United States
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14
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LUO L, XU R, ZHAO D, ZHONG S. One-dimensional (1D) europium coordination polymer wires: Synthesis, characterization and photoluminescence properties. J RARE EARTH 2010. [DOI: 10.1016/s1002-0721(10)60298-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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15
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Chu L, Hardcastle KI, MacBeth CE. Transition Metal Complexes Supported by a Neutral Tetraamine Ligand Containing N,N-dimethylaniline Units. Inorg Chem 2010; 49:7521-9. [DOI: 10.1021/ic1008347] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Lei Chu
- Department of Chemistry, Emory University, Atlanta, Georgia 30322
| | | | - Cora E. MacBeth
- Department of Chemistry, Emory University, Atlanta, Georgia 30322
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